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A. Sedgwick, "A Monograph of the Genus Peripatus," Quart. Journ. of Mic. Science, vol. xxviii., and in Studies from the Morphological Laboratory of the University of Cambridge, vol. iv.
A. Sedgwick, "A Monograph of the Development of Peripatus capensis," Studies from the Morphological Laboratory of the University of Cambridge, vol. iv.
F. M. Balfour, "The Anatomy and Development of Peripatus capensis," edited by Professor H. N. Moseley and A. Sedgwick, Quart. Journ. Mic. Sci. xxiii. pp. 213-259, pls. xiii.-xx. 1883.